Pen



FIG. 1 is a perspective view of a pen in full lines with a hand shown in broken lines representing environmental association matter being for illustrative purposes only and forming no part of the claimed invention.

FIG. 2 is a front elevational view of the pen.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image of the left side view.

FIG. 5 is a top plan view of the pen; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a pen, as shown and described. 